My guess is that will be a White male as President and a Black female as Vice-President. Those racial assignments could possibly be reversed. Both candidates will be obscure political figures, unknown to the general public.
The Vice-President will be a Republican. A RINO, to be sure. The President will, of course, be a Democrat. They will get along perfectly by all accounts, and they will look beautiful together on television. They will both be skilled public speakers.
I believe they are squabbling now over which which replacement team will take those positions, and how the switch can be sold to the electorate.
Biden's deteriorating condition will force them to act before they intended to do so, and without all necessary preparations completed. The outcome is dicey.
Assuming SlowJoe fails before Nov 2024, Harris as POTUS is going to “own” all the bad stuff that is happening in the country. I think the Dems will be very happy to put her in the dumpster and try to nominate another candidate.